Armature for distant-control indicators for continuous and alternating current



- l 630 503 May 31, 1927. H. USENER ARMATURE FOR DISTANT CONTROL INDICATORS FOR commuous AND ALTERNATINGM URRENT Filed April 28. 1923 Patented May 31, 1927.

UNITED STATES PATENT OFFICE.

HANS venues, on man, GERMANY. i

ARMATURE non DISTANCE-CONTROLiNDIGATORS FOB conrrnnons AND ALTERNATING CURRENT.

Application fi1ed April 28, 1923, Serial No. 635,395, and in Germany December 16,1922.

The present invention relates to a novel form of armature in electromagnetic machinery, especially adapted for use in an rangements for transmitting signals by the different angular portions'of the ari'nature at a transmitting station which cooperates with a sim lar armature at the receiving station. Transmitting systems of this character are wellknownin the art. f

The particular improvement here involved relates to certain constructional forms of the armature by which certain advantages, hereinafter pointed out, are gained.

In signalling systems of the above character it is frequently required that thearma ture of the electromagnetic transmitter and receiver assume a great many different angular positions, in order to transmit alarge number of signals represented by these different positions. Also frequently a great numberof such individual transmitters o1 receivers are mounted side by side.

The former requirements necessitates great sensitiveness of the armature to changes in current so that for instancethe armature of the receiver will readily follow even slight size which at the same time are responsive} to even small angular displacements between the transmitter and receiver.

A constructional form of the invention is illustrated in the drawing which represents the device in longitudinal section.

Referring to the drawing 1 is an armature shaft which is journalled at 2 in the cover 17 of the indicator casing 18. The, inner end of the shaft is journalled in a step bearing 5 provided at the inner end of an adjustment screw 4 secured in the apparatus in the following manner. A stationary iron core 9 is arranged in the casing between the two poles 1 1 of the indicator system, this core being provided with a rearwardly extending sleeve 8 threaded into the rear wall 19 of the easing and secured by means of a loch: nut

Thissensitiveness has heretofore been The aforementioned screw 1 is threaded into this sleeve and the shaft bearing end as shown consists of a finely polished point .6 and a small distance away from this point a collar 'i' is provided. By thus arranging the journallingof the inner end of shaft 1 it may be very exactly adjusted againstundue longitudinal motion and it is journalled with very little friction since when the apparatus is used in rip-right position the end 6 of the shaft serves as a step bearing and when the apparatus is used in horizontal position the collar 7 which of course if also finely polished serves as abearing. H

Shaft 1 is provided with a long threaded portion onto-which is threaded a hub 10 which carriesa shell 11 which completely surrounds stationary core 9 including the greater portion of the sleeve 8 of that core. This shell is composed of metal in case direct. current is employed and of a suitable in sulating material in case'alternating current is employed. This shell 11 carries the armature winding .12 and it maybe properly adjusted in the magnetic field produced by poles 14-, and so that it clears the fixed iron core 9 uniformly on all sides, by meansof adjusting the threaded hub 10 on shaft 1. By thisnovel arrangement the weight of the armature itself is materially reduced, carryingno heavy core so that it becomes very sensitive to even light torques exerted by any field induced thru currents flowing in "the armature so that thisarmature maybe held within "comparatively small dimensions.

At the same time by theparticular cor-econst-ruction the core is notsupportedin any .way from {the armature or its shaft iat the bearings of the latter and thus the weight of the heavy core hinders in no way by friction the free movement of the armature which would otherwise occur if the core were centrally supported at its free inner end of the armature shaft as is the practice in the art at present. li urthermoro the shaft 1, only carrying the light weight of the armature, is journalled by thisnovel arrangement at its inner end very near the center of gravity of the armature and thus the weight of the armature becomes effective at the end of the shaft which is particularly delicately journalled and in which frictional losses thus become least effective. Thus the bean ing at the outer end 2 of the shaft only becomes a guiding bearing rather than a bear ing which carries a substantial portion of the armature Weight. The end of the shaft protruding beyondthe casing cover 17 is provided with a square portion as shown at 16 on which a hand may be mounted and a which is held in place by the nut 15.

By this novel arrangement the weightot the armature itsell'is materially reduced so that it becomes'v'ery sensitive to even slight torques exerted by any field induced through currents flowing in the armature, so that the armature may be held Within comparatively small dimensions. At the same time, by the particular core construction, the core does not receive any support from the armature at the bearings of the latter and thus the weight of the heavy core does in no way hinder by friction thel'ree movement of the armature, which otherwise would occur if the core were centrally supported at its free inner endon the armature shaft as is the practice in the art at present.

1. An electromagnetic indicator ofthe character described having fixed field poles, an iron core disposed between said poles and having a sleeve extending from one of its ends, means for holdingsaid sleeve fixed at its free end to maintain said core in fixed position between said poles, and an armaturewinding disposed between said poles and completely surrounding said core and means iournalled iii-said sleeve for rotatably supporting said winding to permit it to freely rotate around said core.

2. An electromagnetic indicator of the character described having fixed field poles,

its free end to maintainsaidcore in fixed position between said poles,*a longitudinally ad ustable step bearlng extending into said.

an iron corefldisposed between said polesand havinga sleeve extending from 'one of lllS ends, means for holdlng said sleeve fixed at sleeve, indicator shaft extending into said 1 core from thelmsnpported end of the-latter "and being jonrnalled in said step bearing,

nleansfor journallingthe"outer end of said i shaft, and an armature Winding disposed an iron core disposed'between said poles and having a sleeve extending from one of its ends, means for holding, said sleeve fixed at its free end to maintain said core in fixed position between said poles, a longitudinally adjustable step bearing extending into said sleeve, an indicator shaft extending into said core from-the unsupported end of the latter and being journalled in said step hearing, means for journalling the outer end of said shaft, and a shell carrying an armature winding and being disposed between said poles, said shell completely surrolmdin said core and means for adjustably fixingsaid shell to said shaft near its step bearing end to permit the shell to freely rotate around said core. 1 i

a. An electromagnetic indicator oftlie dharacter described having a casing and fixed field poles mounted in said casing, an iron core disposedbetween said poles and having a sleeve extending from one of its ends, said sleeve being fixed at its free end to said casing thereby serving as asole support for said core, a longitudinally adjust able step bearing extending into and being;

mounted in said sleeve, an indieator shalt extending intosaid core from the nasal] ported end of the latter and being journalled m1 sa1dstep bearing, the outer end of sa1d shalt being ournalled in said raw ing and being disposed between said poles,

said shell completely sln'rountlingsaid core and means for adjnstablvfixing saidshell to said shalt near its step bflll'llh: end to a permit the shell to freely rotate around said a: 

